Apparatus for ascertaining the density of gas.



Patented June-la, 19m.

m.'AnuT. APPARTUSFOR ASCEBTAINING THE DENSITY 0F GAS.

(Application May 1, 1895.)

(N0 llodl.)

MAX ARNDT, OF AIX-LACHAPELLE, GERMANY.

APPARATUS FOR ASCERTAINING THE DENSITY OF'GAS.

SPECIFIGATION forming part of Letters Patent No. 676,858, dated June 1S, 1901. Application tied May 1, 1895. serial No. 547,513. (No model.)

To ctZZ whom t may 00L-30771,:

Be it known that I, MAX ARNDT, a subject of the German Emperor, residing in Aix-la- Chapelle, in the Kingdom of Prussia, Germany, have invented' certain new and useful Apparatus for Ascertaining the Density of Gas; and I do hereby declare that the follow'- ing is a full,clear, and exact descriptionf the invention,which will enableoth'crn skilled in the art to which it appertains to make and use the same,

This invention has been patented in the followingcountries and in no others :l Great Britain, No. 6,211, dated May 26, 1896; Belgium, No. 114,851, dated April 16,18%;Francalo 246,293, dated July 11,1895; Austria-Hungary, dated August 16, 1895,and Germany, No. 96,728, dated February 7, 1898.

This invention relatest-o gas-balances in which one weighing or balancing part of the balance is suspended in the air-space of the gas-balance and the other weighing part is suspended in the gas to be weighed, the weight of the gas being made known by the movements of this latter weighing part, which are communicated to it by reason of the dierence between the specific gravity of the gas to be weighed and atmospheric air.

The apparatus of the invention consists of a gas-balance in which two Weighing parts are in connection with a balance-beam, one of said parts being suspended in air and the other in the gas to be weighcfhthe latter being incloscd in aA gas vessel through which the gas to be weighed is gas-balance is inclosed in an airtight case.

In the accompanying drawings, Figure l is a sectional View of the gas-balance; Fig. 2, a similar View of a modified form thereof; Fig. 3, a sectional View of a weighing or balancing part. Figs. 4, 5, G, and 7 are sectional v1ews,on a smaller scale, of variousvmodiiied forms of the gas-balance.

In the construction shown in Fig. 2 the gas Vessel is located underneath the closed case containing the balance and is shut off from the case by a water seal.

In Fig. 4 there is a special air-container 'contiguous to the gas vessel.

In Fig. 5 the weighing or balancing parts are rigidly attached to the balance-beam.

ving part d Yin communication through tubes t' t2 caused to pass. The

In Fig. 6 the gas vessel is located above the balance-case.

In Fig. 7 the gas vessel and a special air vessel are placed underneath the balance-case.

ct is an air-tight case, which may be furnished with one or more panes of glass; b, the beam of a balance placed within the case a; c d, weighing or balancing parts in connection with the balance-beam; e,tl1e airspace in which the weighing part c is suspended; f, the gas vessel in which the weighis suspended and tlirough which the gas to be weighed is caused to pass. c is an attachment for adjusting or adding te .the vol u me of part c. l

e', Figs. at and 7, is a special air-container surrounding the weighing or balancing part c.

g represents bowls or trays for the reception of small weights h for placing in equilibrium the suspended parts of the gas-balance'. K t' represents plugs for' closing apertures in the case ci, by which accessis obtained to the vweighing parts Ifor placing them in equi-l librium. I

k is a nozzle filled with Wadding and serving for the admission of fresh air to the case a, m a scale-plate, and n an orifice in the gas vessel f, through which passes the rod carrying the weighing part CZ.

'r' r2 are respectively an inlet and an outlet orifice of the gas vesself, which orifices are with inlet r3 and outlet r4 in the side of the case a, the gas to be weighed entering the gas vessel at 'r' and leaving it at r2.

,e is a pointer fixed at one end to the beam b, while its free end extends over the scaleplate m.

In the gas-balance shown in Fig. 2 the gas vesself is shutoff from the air-space f of the casing a by a liquid seal for the puipose of preventing any mixing of gas and air. In this case the gas vessel is provided with a pipe Z, surrounded by a vessel o, in which latter is placed'thc liquid seal p. rj' is a bellshaped receiver dipping into the liquid seal, so as to completely shut olf the gas to be weighed from the air-space e of the gas-balance. p The fluctuations of the Weighingpart d are carried over to the beam l) through the IOC) suspension-,frame u. In order .that the weigh- .in g operation may not be affected by the varywith the vessel o, and to theweighing part c are suspended the frames so as lto dip into .the liquid of the containers o.

The aggregate cross-sectional area of the dipping-frames w is, with a beam. b having arms of equal length, the same as thatof they dipping-frame u, so that the latter in the oscillation of the. beam b dispiaces in the vessel o just so much of the liquid p as the frames ao displace in the containers o', or il1-v versely, the llevel of the liquidin the several vessels always being the same. With the arms of beam b of unequal length the aggre-4 gate crosssectional -area of the dippingvframesac differs from that-of the frame u in proportion to the diiierence in the length-osaid arms. v

InjFig. 3 an arrangement is shown 0 only one dipping frame or rod and. one corresponding liquid container 0'..

In order that the gas shall not remain sia-l tionary in the pipe Z and receiver q, the lat ter is provided with an orifice fr, which is in connection by a tube ts-withan orifice w in the side of the case a. This orihce w, as also the orifice r2 in the gas vessel f, is in connection with the gas-discharge lpipe or withthe gas-supply pipe. Consequently in the construction shown in Fig. 2 the gas mayT be caused to ow through the gas vessel j', the pipel, and the receiver q either in the direction of the arrows l. 2 from below upward or, inversely, from above downward;

The air-nozzle k' is always in communication with the discharge-pipe, so that in all parts of the gas-balance there is an equal pressure and no iiuctuations of pressure to affect the weighing of the gas.,

In performing the weighing operation the pointer z is placed at zero on the scale m, when in all p'arls of the gas-balance, including the' gas Vessel f, there is air. Gas of a greater specific gravity than that of air is then caused-to pass int`o the gas vessel f. The weighing or balancing part 'd will then be driven upward and the pointers' moved from the right to the left, which movement may be read direct from the scale m. When lighter gases are conducted througlrthe gas vesself, the movement ofthe pointer takes place in an opposite direction. Generally the gases to be weighed are drawn through the gas vessel f by means of a suction apparatus in the direction shown ,by the arrows l 2. The depression thereupon taking place extends through the orifice n to the air-space e and e', and this crassaA while the weighing operation is being performed causes some air to be drawn in the direction shown by arrowB through the nozzle k into the .case a, which'thus receives a sup- `ply of fresh air when gas passes into the airspace e. The gas passes out of the vessel f, Figs. 1, 4, 5, 6, and 7, in thedirecti'on shown 4by arrow 2, together with some air which has entered in the direction of arrow 5; but the outlet r2 is so arranged on the vessel f that thev'weighing part ci is played upon only by gas nnmixed with air.- i l In the construction shown in Figs. 1, 4, 5, 6, and the orice n' is always connected to the gas-supply pipe.

What l claim; as my invention, and desire tosecure by Letters Patent, is

1. A device for weighing gases passing through the-same consisting of a gas vesself which, exceptmt the small orifice through which passes the rod carrying the weighing part d, is closed air-tight and which is pro' K vided with an inlet and an outlet for the gases, ofc? weighing part d held from the beam of a balance so as lto be suspended in the gas, and of a' weighing part c held from said 'balancebeain so as to be suspended in the air within e case which, except at the nozzle k is closed airtight, substantially as Adescribed and 2. A device for weighing gases passing through the same consisting of a gas vessel f which, except at the small orifice through which passes the rod carrying the weighing part CZ, is closed air-tight and which is provided with an inlet and an outlet for the gases, of a weighing part d held from the h eain of a balance .so as to be suspended in the gas, and of a weighing part c held from said balancebeain so aste be suspended in the air within a case which except at the nozzle 7o is closed airtight, and of a liquid-seal device in which the gas vessel fcarries an open pipe'l surrounded by the liquid-seal Vessel o in which latter, U-shaped frames in connection with IOO IIO

the body d, are caused to' dip, substantially v i as described and shown.

3. A device or weighing gases passing through the same consisting of a gas vessel f which, except atthe small orifice through which passes the rodV carrying the'weighing part d, is closed air-tight and which is provided with an inlet and an outlet for the gases, of a weighing part d held from the beam of a:

balance so as to be suspended in the gas, and

of a weighing part c held iroin said balancebeam so as to be suspended in the air within measured as to compensate for any diexence tion in the presence of two subscribing Witin the length of the arms of the beam b and nesses. f

or the Variations in the movement of the n frame u due to the displacement ofliquid MAX ARNDI 5 upon the oscillation of the beam b substan- Witnesses:

tially as described and shown. JOHN HACKMANNS,

In testimony whereof sign this speciica- W. C. EMMEn 

